Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f78e6e7fca7f7e…

MALICIOUS

PDF

77.0 KB Created: 2021-08-28 01:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b6bf78480febed20b4396cad4038df4 SHA-1: 9f5633000a624aa2e980afac77a379d92574e251 SHA-256: 20f78e6e7fca7f7ebbb3b6cbe6757c28668205a08e30bd07df062521e4a2e6ef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the 'Download' button lure further support the conclusion that this document is designed to trick users into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://wittlich-luexem.de/userfiles/file/59447580146.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/mn7p2t3m37c3hgq0ct72f5rsh9/fukajigedano.pdf
    • https://sharenkon.com/files/73837250910.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/93e01e189991907f64539ac2dddd8295/zemenodepu.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/54e830a96d05c699fd6205070c4a6ae2/87617339128.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/ce25dfa24d2e0bdee119340f38603bbf/42140438654.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086212e126f3---japapi.pdf
    • https://geya99.com/ckfinder/userfiles/files/94814633408.pdf
    • http://bethelcommunityone.com/clients/880032/File/ledenodalibulo.pdf
    • http://flex-link.cn/uploadfiles/files/tonivufivegajifiwijad.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4aaf923c1---2169496735.pdf
    • http://net-marketing.hu/images/files/tawinopagova.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b8b82ea61---41640597860.pdf
    • http://kimhoatra.vn/upload/fckimagesfile/87053892557.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef1df378e9---26304555981.pdf
    • http://jmk.kr/ckfinder/userfiles/files/72237581879.pdf
    • http://sochi-riba.ru/ckfinder/userfiles/files/kowewa.pdf
    • http://zpb-maciejewski.pl/upload/fck/file/70165590625.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/g2lae0o6ilmm9c1bmq8orpv7v2/kufixizalepenipomodizeb.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160b84d23c6943---fatitusutifat.pdf
    • http://princeworldwide.com/multimedia/userfiles/file/34176616223.pdf
    • http://canadanur.com/resimler/files/61072986497.pdf
    • http://tks-forever.com/upload/2021/07/28/file/tarubekikosu.pdf
    • http://afghansolar.com/userfiles/file/58187890508.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=merge+multiple+images+into+pdf
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/30792645619.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5d9.bin
b47d715b70bcbe1f60f5b7b91c65144cfa89a5c5e49f516fba57e91712a4a387
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D9 18240 bytes
font_01_sfnt_off0000f4a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A5 16792 bytes
font_02_sfnt_off00010cbc.bin
ab75e4ad39e801d0641080750f151b9bf421e70639eb238c0c26cc3d3241df7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBC 10936 bytes